paper
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The Swiss Army Knife of Vector Graphics Scripting
152 lines (135 loc) • 5.01 kB
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Candy Crash</title>
<link rel="stylesheet" href="../css/style.css">
<script type="text/javascript" src="../../dist/paper-full.js"></script>
<script type="text/paperscript" canvas="canvas">
// kynd.info 2014
function Ball(r, p, v) {
this.radius = r;
this.point = p;
this.vector = v;
this.maxVec = 15;
this.numSegment = Math.floor(r / 3 + 2);
this.boundOffset = [];
this.boundOffsetBuff = [];
this.sidePoints = [];
this.path = new Path({
fillColor: {
hue: Math.random() * 360,
saturation: 1,
brightness: 1
},
blendMode: 'lighter'
});
for (var i = 0; i < this.numSegment; i ++) {
this.boundOffset.push(this.radius);
this.boundOffsetBuff.push(this.radius);
this.path.add(new Point());
this.sidePoints.push(new Point({
angle: 360 / this.numSegment * i,
length: 1
}));
}
}
Ball.prototype = {
iterate: function() {
this.checkBorders();
if (this.vector.length > this.maxVec)
this.vector.length = this.maxVec;
this.point += this.vector;
this.updateShape();
},
checkBorders: function() {
var size = view.size;
if (this.point.x < -this.radius)
this.point.x = size.width + this.radius;
if (this.point.x > size.width + this.radius)
this.point.x = -this.radius;
if (this.point.y < -this.radius)
this.point.y = size.height + this.radius;
if (this.point.y > size.height + this.radius)
this.point.y = -this.radius;
},
updateShape: function() {
var segments = this.path.segments;
for (var i = 0; i < this.numSegment; i ++)
segments[i].point = this.getSidePoint(i);
this.path.smooth();
for (var i = 0; i < this.numSegment; i ++) {
if (this.boundOffset[i] < this.radius / 4)
this.boundOffset[i] = this.radius / 4;
var next = (i + 1) % this.numSegment;
var prev = (i > 0) ? i - 1 : this.numSegment - 1;
var offset = this.boundOffset[i];
offset += (this.radius - offset) / 15;
offset += ((this.boundOffset[next] + this.boundOffset[prev]) / 2 - offset) / 3;
this.boundOffsetBuff[i] = this.boundOffset[i] = offset;
}
},
react: function(b) {
var dist = this.point.getDistance(b.point);
if (dist < this.radius + b.radius && dist != 0) {
var overlap = this.radius + b.radius - dist;
var direc = (this.point - b.point).normalize(overlap * 0.015);
this.vector += direc;
b.vector -= direc;
this.calcBounds(b);
b.calcBounds(this);
this.updateBounds();
b.updateBounds();
}
},
getBoundOffset: function(b) {
var diff = this.point - b;
var angle = (diff.angle + 180) % 360;
return this.boundOffset[Math.floor(angle / 360 * this.boundOffset.length)];
},
calcBounds: function(b) {
for (var i = 0; i < this.numSegment; i ++) {
var tp = this.getSidePoint(i);
var bLen = b.getBoundOffset(tp);
var td = tp.getDistance(b.point);
if (td < bLen) {
this.boundOffsetBuff[i] -= (bLen - td) / 2;
}
}
},
getSidePoint: function(index) {
return this.point + this.sidePoints[index] * this.boundOffset[index];
},
updateBounds: function() {
for (var i = 0; i < this.numSegment; i ++)
this.boundOffset[i] = this.boundOffsetBuff[i];
}
};
//--------------------- main ---------------------
var balls = [];
var numBalls = 18;
for (var i = 0; i < numBalls; i++) {
var position = Point.random() * view.size;
var vector = new Point({
angle: 360 * Math.random(),
length: Math.random() * 10
});
var radius = Math.random() * 60 + 60;
balls.push(new Ball(radius, position, vector));
}
function onFrame() {
for (var i = 0; i < balls.length - 1; i++) {
for (var j = i + 1; j < balls.length; j++) {
balls[i].react(balls[j]);
}
}
for (var i = 0, l = balls.length; i < l; i++) {
balls[i].iterate();
}
}
</script>
</head>
<body>
<canvas id="canvas" resize hidpi="off" style="background:black"></canvas>
</body>
</html>